words_count = (sentences, word) => {
  let wordCount = 0
      // Hapus semua karakter kecuali alphabet, numeric, space dan ubah menjadi bentuk Array.
      sentencesArr = sentences.replace(/[^\w\s]/gi, '').split(' ')

  for (let i = 0; i < sentencesArr.length; i++) {
    if(sentencesArr[i].toLowerCase() == word.toLowerCase()) wordCount++
  }

  return wordCount
}

let setences = "`A wonderful serenity has taken possession of my entire soul, like these sweet
mornings of spring which I enjoy with my whole heart. I am alone, and feel the charm of existence in
this spot, which was created for the bliss of souls like mine. I am so happy `
console.log(words_count(setences, "like")) // 2